move to cmake, add libwebp support (closes #1), add makedepends for chroot building

Hurricane Pootisrequested to merge
hurricanepootis/libtiff:webp into main

Fixes #1 (closed) by adding webp support to libtiff

By adding libwebp to the dependencies array at buildtime, it will build with libwebp compression support. It is important for apps like cartridges.

See issue for more information: here

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